All of our polarized 3-D glasses have 45/135 degree LINEAR polarization, and are for most projected 3-D movies and 3-D slide projection, which additionally require a silver screen and polarizing 3-D filters.

These are not the correct type of 3-D glasses for viewing Red/Cyan 3-D images on the Internet (such as the Nasa/JPL Mars images. Click on Reel 3-D: Anaglyph Glasses for these glasses). These are also not correct for most passive glasses computer monitor displays, such as StereoGraphics' ZScreen, or with many LCD 3-D projector configurations. These systems require CIRCULAR polarized 3-D glasses, which we do not offer. See "Questions and Answers" on this subject at the end of this section.

Cardboard
Frame Polarized 3-D Glasses

When low cost is the main
consideration these offer quality polarizers in cardboard frames. Styles
are subject to change without notice.

Lightweight rigid plastic
frames (temples do not fold) offer a good combination of quality and economy.
The best choice when low cost, multiple use, and large quantities are desired.
Fit easily over eyeglasses, and good for children, too! Black plastic frames,
but color subject to change without notice.

A: Most two-lens 3-D projection
systems for both slides & movies use the full-color polarized method.
Almost anything printed on a page, or displayed on a computer monitor, with
red/blue or red/green color fringing uses anaglyph
(red/blue) 3-D glasses.

Q: How does
polarization work?

A: The principle of polarization of
light for separation of stereoscopic images was proposed in 1891 by J. Anderton.
The polarizing filters have a molecular structure that is like an invisible
picket fence, with all of the pickets going in one direction. When a second
identical polarizer is crossed at 90° to the first polarizer, the light
gray turns a very dark blue or purple, effectively canceling most of the
light transmission. If separate right & left images are projected through
two polarizers, each at 90° to each other, onto a non-depolarizing silver
screen, and then viewed through 3-D glasses which match the projection filters,
each eye sees the image intended for it, while the image for the other eye
is dark. Your brain does the rest, and converts the separate images into
a combined 3-D one.

Q: What are
the polarization angles of your 3-D glasses?

A: At 45° & 135° (which
are 90° to each other). This has been the standard since the early 1940's.
The material itself is a linear polarizer, 30% transmission, either .010"
or .030" thickness, depending on the glasses style.